另一方面，本文研究了特定时期环境管制结构变迁的动力机制。
On the other hand, the article researched the dynamical mechanism to change of the environmental regulation structure in certain period.
本文通过对迄今我国环境管制结构三个时期的划分，主要研究了特定时期我国的环境管制结构及其变迁的动力机制。
By dividing the environmental protection process into three periods, this thesis mainly researched the environmental regulation structure and its dynamical mechanism to change in certain period.
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